In a more literal sense, if you were referring to a common phrase in the fountain pen hobby, enthusiasts often discuss Behind Enemy Lines - Bad Paper! —which focuses on how certain inks perform on low-quality, "common" paper like standard copy or notebook paper.
: The paper Behind Enemy Lines and American Geopolitical Culture examines the 2001 film as a product of post-9/11 American militarism and its portrayal of the Bosnian war. Enemy Lines
If you are looking for an academic paper or scholarly critique, several articles analyze the cultural and political impact of the film Behind Enemy Lines (2001) and real-world intelligence operations: In a more literal sense, if you were
: Reporting from Behind Enemy Lines explores how independent journalists report from conflict zones at great personal risk. Historical Documentation and Essays If you are looking for an academic paper
For those interested in historical records and first-hand accounts on paper:
Depending on whether you are looking for academic analysis, historical accounts, or stationery advice, several "papers" and resources are related to "Enemy Lines."